[INFO] fetching crate redstone-ml 0.0.0...
[INFO] building redstone-ml-0.0.0 against master#c7f6aa2869acdbf014d094c6e427e554e160b6db for pr-146237-2
[INFO] extracting crate redstone-ml 0.0.0 into /workspace/builds/worker-2-tc1/source
[INFO] removed /workspace/builds/worker-2-tc1/source/.cargo/config.toml
[INFO] started tweaking crates.io crate redstone-ml 0.0.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate redstone-ml 0.0.0
[INFO] tweaked toml for crates.io crate redstone-ml 0.0.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate redstone-ml 0.0.0 on toolchain c7f6aa2869acdbf014d094c6e427e554e160b6db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate redstone-ml 0.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded trybuild v1.0.105
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2bb8fe11f3dc909ecff4be268ae48283f45af7718abbc09de292ccacbf821ae3
[INFO] running `Command { std: "docker" "start" "-a" "2bb8fe11f3dc909ecff4be268ae48283f45af7718abbc09de292ccacbf821ae3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2bb8fe11f3dc909ecff4be268ae48283f45af7718abbc09de292ccacbf821ae3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bb8fe11f3dc909ecff4be268ae48283f45af7718abbc09de292ccacbf821ae3", kill_on_drop: false }`
[INFO] [stdout] 2bb8fe11f3dc909ecff4be268ae48283f45af7718abbc09de292ccacbf821ae3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0ec075c8de18462131b866b300f1e9c92c137b4eaee46ffc2cb09eb057d22d7b
[INFO] running `Command { std: "docker" "start" "-a" "0ec075c8de18462131b866b300f1e9c92c137b4eaee46ffc2cb09eb057d22d7b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.93
[INFO] [stderr]    Compiling libc v0.2.169
[INFO] [stderr]    Compiling bitflags v2.6.0
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling redstone-ml v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling quote v1.0.38
[INFO] [stderr]    Compiling syn v2.0.96
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling cpu-time v1.0.0
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling num-iter v0.1.45
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling num-rational v0.4.2
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]    Compiling num v0.4.3
[INFO] [stderr]    Compiling zerocopy v0.7.35
[INFO] [stderr]    Compiling ppv-lite86 v0.2.20
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling rand_distr v0.4.3
[INFO] [stdout] warning: unused import: `first_n_elements`
[INFO] [stdout]  --> src/linalg/specialized_einsum.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{first_n_elements, NdArray};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/flatten.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/homogenous.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/shape.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_add.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{impl_default_trait_for_dtypes, simd_binary_op_specializations};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_mul.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{impl_default_trait_for_dtypes, simd_binary_op_specializations};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_sub.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::impl_default_trait_for_dtypes;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/autograd/gradient_function.rs:16:17
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn gradient(&self) -> Option<NdArray<T>> {
[INFO] [stdout]    |                 ^^^^^            ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn gradient(&self) -> Option<NdArray<'_, T>> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/autograd/accumulate_grad.rs:30:17
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn gradient(&self) -> Option<NdArray<T>> {
[INFO] [stdout]    |                 ^^^^^            ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn gradient(&self) -> Option<NdArray<'_, T>> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.11s
[INFO] running `Command { std: "docker" "inspect" "0ec075c8de18462131b866b300f1e9c92c137b4eaee46ffc2cb09eb057d22d7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ec075c8de18462131b866b300f1e9c92c137b4eaee46ffc2cb09eb057d22d7b", kill_on_drop: false }`
[INFO] [stdout] 0ec075c8de18462131b866b300f1e9c92c137b4eaee46ffc2cb09eb057d22d7b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 552aa2ac8c6c6a757e60106fd35a90acb6285ec880cfcdbf10fca121a3a703d4
[INFO] running `Command { std: "docker" "start" "-a" "552aa2ac8c6c6a757e60106fd35a90acb6285ec880cfcdbf10fca121a3a703d4", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling hashbrown v0.15.3
[INFO] [stderr]    Compiling winnow v0.7.10
[INFO] [stderr]    Compiling toml_write v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stdout] warning: unused import: `first_n_elements`
[INFO] [stdout]  --> src/linalg/specialized_einsum.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{first_n_elements, NdArray};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/flatten.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/homogenous.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/shape.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_add.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{impl_default_trait_for_dtypes, simd_binary_op_specializations};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_mul.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{impl_default_trait_for_dtypes, simd_binary_op_specializations};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_sub.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::impl_default_trait_for_dtypes;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/autograd/gradient_function.rs:16:17
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn gradient(&self) -> Option<NdArray<T>> {
[INFO] [stdout]    |                 ^^^^^            ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn gradient(&self) -> Option<NdArray<'_, T>> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/autograd/accumulate_grad.rs:30:17
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn gradient(&self) -> Option<NdArray<T>> {
[INFO] [stdout]    |                 ^^^^^            ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn gradient(&self) -> Option<NdArray<'_, T>> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling indexmap v2.9.0
[INFO] [stderr]    Compiling serde_spanned v0.6.8
[INFO] [stderr]    Compiling toml_datetime v0.6.9
[INFO] [stderr]    Compiling serde_json v1.0.140
[INFO] [stderr]    Compiling toml_edit v0.22.26
[INFO] [stderr]    Compiling toml v0.8.22
[INFO] [stderr]    Compiling trybuild v1.0.105
[INFO] [stderr]    Compiling redstone-ml v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `first_n_elements`
[INFO] [stdout]  --> src/linalg/specialized_einsum.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{first_n_elements, NdArray};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/flatten.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/homogenous.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::recursive_trait_base_cases`
[INFO] [stdout]  --> src/util/shape.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::recursive_trait_base_cases;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_add.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{impl_default_trait_for_dtypes, simd_binary_op_specializations};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_mul.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{impl_default_trait_for_dtypes, simd_binary_op_specializations};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::impl_default_trait_for_dtypes`
[INFO] [stdout]  --> src/ops/binary_op_sub.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crate::impl_default_trait_for_dtypes;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/autograd/gradient_function.rs:16:17
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn gradient(&self) -> Option<NdArray<T>> {
[INFO] [stdout]    |                 ^^^^^            ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 16 |     fn gradient(&self) -> Option<NdArray<'_, T>> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/autograd/accumulate_grad.rs:30:17
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn gradient(&self) -> Option<NdArray<T>> {
[INFO] [stdout]    |                 ^^^^^            ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 30 |     fn gradient(&self) -> Option<NdArray<'_, T>> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 33.73s
[INFO] running `Command { std: "docker" "inspect" "552aa2ac8c6c6a757e60106fd35a90acb6285ec880cfcdbf10fca121a3a703d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "552aa2ac8c6c6a757e60106fd35a90acb6285ec880cfcdbf10fca121a3a703d4", kill_on_drop: false }`
[INFO] [stdout] 552aa2ac8c6c6a757e60106fd35a90acb6285ec880cfcdbf10fca121a3a703d4